5561647789 has 4 divisors (see below), whose sum is σ = 5585517756. Its totient is φ = 5537777824.

The previous prime is 5561647787. The next prime is 5561647807. The reversal of 5561647789 is 9877461655.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9877461655 = 5 ⋅1975492331.

It can be written as a sum of positive squares in 2 ways, for example, as 2551260100 + 3010387689 = 50510^2 + 54867^2 .

It is a cyclic number.

It is not a de Polignac number, because 5561647789 - 2¹ = 5561647787 is a prime.

It is a super-2 number, since 2×5561647789² = 61863852257777177042, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5561647787) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11934634 + ... + 11935099.

It is an arithmetic number, because the mean of its divisors is an integer number (1396379439).

Almost surely, 2^5561647789 is an apocalyptic number.

It is an amenable number.

5561647789 is a deficient number, since it is larger than the sum of its proper divisors (23869967).

5561647789 is a wasteful number, since it uses less digits than its factorization.

5561647789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23869966.

The product of its digits is 12700800, while the sum is 58.

The square root of 5561647789 is about 74576.4559965141. The cubic root of 5561647789 is about 1771.7447752105.

The spelling of 5561647789 in words is "five billion, five hundred sixty-one million, six hundred forty-seven thousand, seven hundred eighty-nine".